dev-python/pygame: tweak library search path for prefix

By default libraries are searched at /usr and /usr/local.
For prefix we need to add offset. Build system provides
LOCALBASE to override defaults.

Package-Manager: Portage-2.3.10, Repoman-2.3.3

dev-python/pygame/pygame-1.9.3.ebuild

@@ -31,7 +31,7 @@ DOCS=( WHATSNEW )
 RESTRICT=test
 
 python_configure() {
-	PORTMIDI_INC_PORTTIME=1 "${EPYTHON}" config.py -auto
+	PORTMIDI_INC_PORTTIME=1 LOCALBASE="${EPREFIX}/usr" "${EPYTHON}" config.py -auto
 
 	if ! use X; then
 		sed -e "s:^scrap :#&:" -i Setup || die "sed failed"